Open your pdf in Files, click on the share button in the bottom left, and then select collaborate under the file-name. You can then send your file to other iOS-users and collaborate on the file. (You can even keep a discussion on the file)
Open your pdf in Files, click on the share button in the bottom left, and then select collaborate under the file-name. You can then send your file to other iOS-users and collaborate on the file. (You can even keep a discussion on the file)
Go to a folder with the images you want to combine.
How to scan, edit, sign, and manage PDFs directly on your iPhone using the Files app